Silicon photonics has been promising a revolution in data centers for years, but 2026 is starting to look like the moment when that promise may begin to translate into real industrial deployments. According to the Taiwanese newspaper Commercial Times, TSMC expects its integrated silicon photonics platform, COUPE, to enter mass production this year. If confirmed on schedule, this would position the company at the forefront of the race to bring optical technology directly to AI chip packaging.
This news matters because the AI bottleneck is no longer just about computing power. It also depends on how data moves within large clusters. As models grow, GPUs and switches demand more bandwidth, lower latency, and better energy efficiency. In this context, the industry is seeking to replace traditional electrical interconnections with optical links much closer to the processor, in a strategy known as CPO, or co-packaged optics.
While TSMC has not yet issued an explicit press release confirming mass production in 2026, it has been clear for some time that COUPE is part of its roadmap. In its 2024 business report, the company noted that the first generation of COUPE, based on an electrical chip bonded to a photonic chip via SoIC assembly, has advanced well. Its technical documentation describes this architecture as a platform capable of meeting the most demanding HPC requirements and paving the way for system-level integration based on silicon photonics.
What is COUPE and why is it significant
COUPE stands for Compact Universal Photonic Engine. Simply put, it is TSMC’s proposal to integrate photonic and electronic circuits within a single advanced encapsulation environment, bringing optical blocks and compute or control ASICs as close together as possible. The goal is to reduce coupling losses, shorten component distances, and increase system efficiency—especially critical for AI data centers moving massive amounts of information between accelerators, switches, and memory.
This integration relies on SoIC, TSMC’s 3D stacking technology. The company explains that its TSMC-SoIC platform is designed to reassemble chiplets via high-density 3D stacking, responding to the growing demands for compute power, bandwidth, and low latency in cloud, networking, and edge applications. For COUPE, this capability is especially valuable because silicon photonics requires the optical and electronic worlds to be as close as possible without increasing power consumption or adding additional penalties to the package.
TSMC is not working alone in this field. In April 2024, Ansys announced a collaboration with the Taiwanese foundry to provide multi-physics simulation support for COUPE. They described the platform as an integrated system combining silicon photonics and CPO, aimed at significantly accelerating chip-to-chip and machine-to-machine communication in cloud, data centers, HPC, and AI applications. These partnerships show that the project is moving beyond research, into industrial design and ecosystem development.
The CPO is no longer a distant promise
Industry interest in CPO is better understood in light of the pressure AI is placing on intra-data center networks. SEMI recently reported, during its SiPhIA alliance forum, that the demand for high-speed optical interconnects in AI data centers is pushing silicon photonics from laboratory validation toward large-scale production. The alliance, which now counts over 150 companies, focuses on high-speed modules of 1.6 T and 3.2 T, clearly indicating that the sector is leaving behind the purely experimental stage.
Along with technological pressure, standardization efforts are also advancing. In 2023, OIF published its first implementation agreement for a 3.2 Tb/s CPO module, targeting Ethernet switching applications and designed to enable optical and electrical interfaces in switches with up to 51.2 Tb/s aggregated bandwidth. Standardization alone doesn’t solve manufacturing challenges, but it helps create a clearer framework for interoperability, connectivity, and module design across the industry.
Another major sign of maturity came from NVIDIA. In March 2025, the company introduced its Spectrum-X Photonics and Quantum-X Photonics switches, based on silicon photonics and developed within an industrial ecosystem including TSMC. TSMC Chairman and CEO C.C. Wei stated that the company’s silicon photonics solution combined advanced manufacturing with SoIC 3D stacking to help NVIDIA scale AI fabrications to nearly a million GPUs. NVIDIA also announced that the Ethernet version of Spectrum-X Photonics would arrive in 2026—coinciding with the expected mass production of COUPE.
What could change if TSMC meets the schedule
If COUPE truly enters production this year, the industrial implications are significant. It wouldn’t mean that all AI infrastructure will immediately switch from copper to co-packaged optics, but it would indicate that one of the most complex puzzle pieces is moving out of the testing and sampling phase. This could speed up design decisions for AI networks, next-generation switches, integrated optics, and interconnect architectures with improved energy-per-bit efficiency.
Nevertheless, it’s important not to overstate. SEMI reminds us that the biggest challenges for silicon photonics at an industrial scale still include wafer-level testing, precise fiber-to-PIC alignment, high-speed optical assembly, and cost reduction. In other words, entering production marks a new phase but doesn’t eliminate existing problems. The industrialization of CPO will depend on both the underlying technology and the entire supply chain’s ability to manufacture, test, and scale with acceptable yields.
All in all, TSMC’s move aligns with a broader trend: AI is reorganizing not only chip fabrication but also how those chips connect. In this new phase, silicon photonics is no longer a futuristic idea but a viable candidate to support the next wave of increased bandwidth in data centers. If 2025 was the year of prototypes and initial products from major suppliers, 2026 might be remembered as the year when CPO started to make its mark industrially.
What exactly is TSMC’s COUPE?
It’s TSMC’s silicon photonics platform, officially called Compact Universal Photonic Engine. It is designed to integrate electronic and photonic circuits in a single package and facilitate CPO architectures for AI, HPC, and data center applications.
What advantage does CPO have over traditional electrical links?
CPO aims to reduce the distance between processing and optics, increase bandwidth, and improve energy efficiency—key factors as data centers need to move more data without increasing power consumption, heat, or signal loss.
Has TSMC officially confirmed that COUPE will be mass-produced in 2026?
The 2026 mass production date has been reported by Commercial Times and other industry outlets. TSMC has publicly confirmed progress on the first generation of COUPE and its platform work but has not yet issued an official statement with such a specific timeline.
Why is silicon photonics so important for AI?
Because AI clusters need to transfer increasing amounts of data between GPUs, switches, and accelerators. Silicon photonics and CPO are emerging as solutions to support this demand, offering higher density bandwidth and better efficiency than purely electrical interconnects.
via: Jukan and ctee.com.tw